1. Belt and synchronous pulley of our company can be attached of replaced by imported belt and synchronous pulley. 2. Please supply drawing when you order.We can also draw for clients as their supplied specificationhole, key way and width. 3. The tolerance of outside dimaeter, and bounce & wrap direction of synchronous puller should conform to Form 1, form 2& torm 3. 4. Width of different specifications of timing belt and synchronous pulley must comform to form 4. 5. Outside diamtent of synchronous pulleys and size should be as same as form's regulation. 6. We can also produce synchronous pulleys even sizes are not in the form. 7. The material of synchronous pulley are mainly composed of carbon steel, if possible,aluminum alloy, nylon can also be employed; If external diameter is larger than 250mm, iron is sued.